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A roller coaster car goes around a loop-the-loop, so it is upside down at the top at
point A. The radius of the loop is R.
The normal force on the car at the top of the loop is equal to 3mg.
What is the speed of the car at the bottom? Ignore friction.
A
R
V 69R
V 4gR
O V59R
/2gR
OV89R

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